An expression is anything that can be evaluated ("calculated"), to get a value. Numeric expressions are more common: anything that you can calculate, and get a number. For example, if a and b are numbers, a + b will give you another number - it is therefore a numeric expression. The variables by themselves are also numeric expressions.

A boolean expression is anything that you can evaluate and get a result that is boolean, i.e., either true or false. Here are some examples:

a == b

a > b

a >= 5 && a <= 10 // && means "and"

Any method that returns either true or false, for example (for the String class) the method matches(), which states whether the string does, or does not, match a certain pattern.

An expression is anything that can be evaluated ("calculated"), to get a value. Numeric expressions are more common: anything that you can calculate, and get a number. For example, if a and b are numbers, a + b will give you another number - it is therefore a numeric expression. The variables by themselves are also numeric expressions.

A boolean expression is anything that you can evaluate and get a result that is boolean, i.e., either true or false. Here are some examples:

a == b

a > b

a >= 5 && a <= 10 // && means "and"

Any method that returns either true or false, for example (for the String class) the method matches(), which states whether the string does, or does not, match a certain pattern.

An expression is anything that can be evaluated ("calculated"), to get a value. Numeric expressions are more common: anything that you can calculate, and get a number. For example, if a and b are numbers, a + b will give you another number - it is therefore a numeric expression. The variables by themselves are also numeric expressions.

A boolean expression is anything that you can evaluate and get a result that is boolean, i.e., either true or false. Here are some examples:

a == b

a > b

a >= 5 && a <= 10 // && means "and"

Any method that returns either true or false, for example (for the String class) the method matches(), which states whether the string does, or does not, match a certain pattern.

An expression is anything that can be evaluated ("calculated"), to get a value. Numeric expressions are more common: anything that you can calculate, and get a number. For example, if a and b are numbers, a + b will give you another number - it is therefore a numeric expression. The variables by themselves are also numeric expressions.

A boolean expression is anything that you can evaluate and get a result that is boolean, i.e., either true or false. Here are some examples:

a == b

a > b

a >= 5 && a <= 10 // && means "and"

Any method that returns either true or false, for example (for the String class) the method matches(), which states whether the string does, or does not, match a certain pattern.

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